Our final lesson on heat loss was to do with radiation. Radiation is the name for heat travelling as heat rays. No particles are needed for this to happen, so radiation can happen in a solid, a liquid or a gas. It can even happen in space, where there are no particles at all. This is how heats gets to the Earth from the sun.

We investigated whether silver or black surfaces give out heat by radiation quicker. We measured the temperature of hot water in the beakers every 5 minutes for 20 minutes to find out how quickly they gave out heat.

Every group found that the black flask lost its heat quicker than the silver flask. This means that the black flask radiates heat faster than the silver flask.